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<title>Ensure Vocabulary JSON-LD is valid</title>
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    <p>The Annotation Vocabulary JSON-LD context is defined to be at http://www.w3.org/ns/oa</p>
    <p>Retrieve that context document and expand the following example using a JSON-LD validation tool.  Does it expand?</p>
    <pre>
{
  "@context": "http://www.w3.org/ns/anno.jsonld",
  "id": "http://example.org/anno4",
  "type": "Annotation",
  "body": "http://example.org/description1",
  "target": {
    "id": "http://example.com/image1#xywh=100,100,300,300",
    "type": "Image",
    "format": "image/jpeg"
  }
}
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